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X-Ray Warm Absorber Variability of the Seyfert Galaxy Arakelian 564

Nouh, M. I.; Korany, B.

We studied the variability of warm absorber clouds of ionized gas within AGN for the Seyfert 1 galaxy Arakelian 564. The X-ray spectra for four XMM-Newton observations of this object are analyzed using the EPIC and the RGS instruments. These four observations covered 11 years. The ionization parameter ξ of the absorbing matter changed between obse…

X-ray emission of OH megamaser galaxies

Hambaryan, V. V.; Kandalyan, R. A.; Sabat, H. A.

The properties of OH megamaser galaxies in the x-ray region are discussed. Observational data from the XMM-Newton x-ray satellite are presented for three megamasers, IRAS 01418+1651, IRAS 11010+4107, and IRAS 13218+0552. Based on a sample of OH megamaser galaxies it is shown that the x-ray and OH emission are closely coupled. Megamaser emission al…